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You have the right shape, although the closer you can get to a knife edge, the better. I would not use a bumper, too heavy.
My next tail is going to be based on a trailer hitch receiver, with a tee shaped square tube insert, probably a plywood body, although there might be some coroplast used on it too.
If you build it right, i would guess that you can expect a 20% to 30% improvement in FE.
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